[chimera-dev] new keyword arg for added commands

[Eric Pettersen]

	If you have code that adds commands to Chimera using the addCommand 
() function, there is a new keyword to that function so that  
animation scripts can work better.  The keyword is 'changesDisplay'  
and is a boolean that defaults to True.  If your command typically  
changes the display in the main graphics window somehow the keyword  
should be True, otherwise False.
	It's needed so that as a script is executed, Chimera knows after  
each line whether a new frame is necessary or not.  For instance, for  
the 'alias' command the value is False since after executing that  
command in a script you would not want to record a new frame in an  
animation.

--Eric


                         Eric Pettersen
                         UCSF Computer Graphics Lab
                         http://www.cgl.ucsf.edu


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